2. Infrared spectroscopy is a useful technique in forensic chemistry, particularly in crime laboratories, for identifying unknown substance that have been seized from drug impoundments. Shown below are the structures of four compounds that all exist as white powders. Match the infrared spectra labeled A - D (on the following page) to the four compounds shown below using diagnostic IR signals for each molecule. Place the letter of the corresponding IR spectra in the box next to the molecule. H3C-N IR Spectra CO2CH3 cocaine NHCH IR Spectra CH methamphetamine IR Spectra , OH y-hydroxybutyrate HO HO OH 0 IR Spectra o 0 HO OH HO I " sucrose B C D